Porosimetry
Mostrando 1-12 de 54 artigos, teses e dissertações.
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1. Microbial activity and studies on excavated megalithic micaceous potsherds from Peninsular India
Abstract The abundantly available mica flakes were added in raw materials to manufacture pottery in Central Peninsular India during the early Iron Age (700-300 BCE) for storage and glittering. The micaceous potsherds from the excavated megalithic site of Nagpur were studied for their composition, manufacturing techniques, microstructural features, microbial
Cerâmica. Publicado em: 2021-06
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2. Effect of nano-silica on Portland cement matrix
Resumo O uso de nanopartículas é uma tendência recente que pode assumir um papel importante para melhorar o desempenho mecânico do cimento Portland. O objetivo deste estudo é avaliar o efeito da nanossílica na matriz de cimento Portland. A distribuição do tamanho das partículas da matriz de cimento Portland foi modificada pela incorporação de 11,
Rev. IBRACON Estrut. Mater.. Publicado em: 13/12/2019
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3. Pastas de ultra-alto desempenho submetidas a cura sob pressão
Resumo A aplicação de pressão em misturas cimentícias tem efeitos positivos no desenvolvimento da microestrutura e nas propriedades mecânicas da matriz endurecida. Contudo, os benefícios têm sido estudados em níveis altos de pressão ou combinados com cura térmica. Este artigo está inserido em uma pesquisa em que foi proposto um equipamento alterna
Ambient. constr.. Publicado em: 10/06/2019
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4. Porosity Characterization of Iron Ore Pellets by X-Ray Microtomography
This work proposes a three-dimensional methodology to characterize porosity in iron ore pellets by X-ray Microtomography (microCT). An image analysis routine was developed to discriminate and quantify open/closed porosity. The results were compared to the traditional techniques of mercury intrusion porosimetry (MIP) and optical microscopy (OM). As expected,
Mat. Res.. Publicado em: 22/01/2018
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5. Hybrid Membranes of Polyamide Applied in Treatment of Waste Water
In this work, it was prepared hybrid membranes of polyamide6 (PA6) with montmorillonite (MMT) and porogenic agent (CaCl2). The hybrid membranes with CaCl2 were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), porosimetry by mercury intrusion
Mat. Res.. Publicado em: 16/01/2017
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6. Design of a New Molecularly Imprinted Polymer Selective for Hydrochlorothiazide Based on Theoretical Predictions Using Gibbs Free Energy
A molecularly imprinted polymer (MIP) for the diuretic drug hydrochlorothiazide (HCTZ) based on theoretical predictions was developed. Molecular modeling calculations were performed to study the intermolecular interactions in the pre-polymerization mixture and to select a suitable functional monomer and a porogenic solvent for the synthesis of the MIP. To co
J. Braz. Chem. Soc.. Publicado em: 2016-12
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7. Structural Characterization of Calcium Sulfate Bone Graft Substitute Cements
The aim of this work was to study the structural characteristics of commercially available bone graft substitute (BGS) ceramic cements. In particular, the microstructure of two calcium sulfate cements was investigated. For this purpose, nitrogen and mercury porosimetry, x-ray diffraction (XRD) and scanning electron microscopy (SEM) measurements have been car
Mat. Res.. Publicado em: 22/08/2016
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8. Characterization of Mullite Ceramic Membranes and their Application in the Removal Escherichia Coli
This paper aims the morphological and structural characterization of ceramic membranes of mullite and their application in the removal of Escherichia coli. A complex irregular structure presented by the pores of the membrane was verified by scanning electron microscopy (SEM). The average pore size and distribution were determined by mercury intrusion porosim
Mat. Res.. Publicado em: 05/04/2016
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9. Mechanical and Durability Performance of Polyacrylonitrile Fiber Reinforced Concrete
In this paper, the impact toughness, autogenous shrinkage, chloride penetration resistance, permeability resistance and abrasion resistance performance of prepared concrete reinforced with Polyacrylonitrile fiber (PAN fiber) were researched. The PAN fiber volume concentration percentages of cement were 0, 0.5%, 1.0%, 1.5% and 2.0%, respectively. The results
Mat. Res.. Publicado em: 03/11/2015
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10. Production of porous ceramic materialusing different sources of alumina and calcia
ABSTRACTNumerous papers and publications report the use of microporous calcium hexaluminate (CaO.6Al2O3; CA6) as a key raw material for high temperature insulating materials. This material has unique properties with respect to chemical purity and mineral composition. Another important property of CA6 is its structure, which consists of platelet-shaped crysta
Matéria (Rio J.). Publicado em: 2015-09
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11. Preparation and Characterization of PA66/Alumina Composite Membrane
In this study, polymer/ceramic composite membranes were prepared and characterized. The polymer used was polyamide 66 (PA66) deposited by dip coating on the inner surface of α-alumina-based (Al2O3) microporous tube. A coating on the ceramic support surface and the formation of the selective layer was analyzed by scanning electron microscopy (SEM) in membran
Mat. Res.. Publicado em: 2015-08
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12. Comparison of polymers and ceramics in new and discarded electrical insulators: reuse and recycling possibilities
The expansion and maintenance of electricity distribution networks generates large amounts of waste, much of it in the form of discarded insulators that are not reused or recycled. This paper describes the results of tests on used and new ceramic and polymeric insulators to verify if their exposure to weathering justifies their replacement. In new and used c
Matéria (Rio J.). Publicado em: 2013-12